Mill for grinding grain



T. PROKOPOWICZ.

MlLL FOR GRINDING GRAIN. APPLICATION FILED Jun-z 20.- ms:

PatentedSept. 27, 1921.

2 SHEETS--SHEET I STATESI THOMAS rnokorowroz, on ST. Louis, MIssounr.

PATENT OFFIC 'MILL FOR GRINDING GRAIN.

To aZZ whom it may concern: 7

Be it known that I, THOMAS Pnoxorowroz, a citizen of Poland, residing at 1445 W. 16th street, St. Louis, county of St. Louis City and State of Missouri, have invented certain new and useful Improvements inMills for Grinding Grain, of which the following is a specification.

This invention has as its Object the provision of a mill adapted for grinding grain combined, with a. movable sieve. of novel design whereby the ground material is screened and sifted as it .is deliveredinto,

receivers. V I

A further objectis to provide agrinder or mill in which the hopper is constantly agitated so that the grain is fed to the grinding devices in a continuous stream.

These and other like objects-are attained by the novel construction and combination of parts hereinafter described, and shown in the accompanying drawings, forming a material part of this disclosure, and in which Figure 1 is a top plan view showing a sifting mill made in accordance with the invention.

Fig. 2 is a front elevational View of the same.

Fig. 3 is a vertical sectional view taken on line 33 of Fig. 2, and

Fig. 4 is an enlarged transverse sectional view taken on line 44 of Fig. 3.-

Referring to the drawings in detail, the numeral 10 generally represents a substantial frame, having a rigid cover plate 11, and containing fixed horizontal bars 12, 13, 14 and 15 and flooring 16, raised from the bottom of the frame as indicated.

Mounted on the flooring 16, is a motor 18, over the driving wheel of which is trained a belt 19, conveying rotary motion to a pulley 20, mounted on a horizontal shaft 21, carried in brackets22 and 23, supported in the frame through which the shaft extends and drives a relatively heavy fly-wheel 24.

Upon the opposite, inner end of the shaft 21 is secured a bevel gear 25, meshing with a mating pinion 26 fixed upon a vertical shaft 27, supported in a foot bearing formed in the transverse bar 14, and extending up through the cover 11, below which is pro vided a fixed collar 28. 'A raised grinding surface 29 is fixed in the frame adjacent to the lower side of the grinding wheel 30, which is mounted upon the upper end of the shaft 2 Specification of Letters Iatent. Patented Sept. 27, 1921. Applicationfiled June 20, 1919. Serial No.:305,587.

pass-through the annular spaces33 formed in the other portion of the grindingwheel. The rim 34, forming the wall of the recess ,33, has a plurality of vertically disposed,

inwardly extending lugs 35, adapted, as the wheel is rotated, tomake contact with a dbwnwardly extendingprojection 36, se-

cured to the hopper 37, which is supported over the opening in thecasing31bymeans of chains 38 secured at their inner endsto the corners of the hopper and at their opposite, outerends to a frame 39, rigidly mounted on top of the cover plate 11, the arrangement being such-to move the hopper freely sidewise so that grain passingout from the opening 41 into the hopper 37, to enter in a stream over the top of the grinding wheel when rotated by the mechanism.'

previously described, thereby agitating the hopper, causing the grain tomove without choking in an obvious, manner. 7

Leading diagonally outward from between the raised grinding elements 29, is .a chute 42 passing through thesides of the casing 10 and connected at its outer end with a cylindrical screen 43, having its lower open end arranged immediately above the sieve 45, arranged longitudinally of the apparatus over a receptacle 46, carried on a supplementary frame 47 at the side of the main frame 10.

A support 48 is attached to the cylindrical screen 43, and provided with an arm 49, fixed in a vertical spindle 50, mounted to rotatebetween the horizontal bars 12 and 13, the spindle 5O beingcaused to oscillate, due to an ar1n51, extending inward, tangentially to the shaft 27, upon which are secured a plurality of radial lugs 52, adapted to make contact with the arm, thereby vibrating the cylindrical screen 43, causing the smaller particles to pass into a receiver 53, extending between the receptacle 46 and casing 10.

Secured to the bottom at one end of the sieve 45, is the long arm 54 of a bell-crank lever, pivoted on the spindle 55, carried between the plate 56 of a receiver and portion of the frame 47, the short arm 57, of the hell'- 1 the transverse bar 12 and flooring 16, the spindle having an arm 51, also adapted to make contact with the lugs 52. i

The inner end 4A of the cylindrical screen is pivoted to move limitedly on the pin 62, set in the bracket 63 in such manner that the central portion of the screen is caused to vibrate, thereby shaking out the smaller particles of its contents into the receptacle 56, while the longitudinal sieve 45, when moved outwardly by the bell-crank lever, is returned by a fiat spring 64, secured at its opposite end to a post 65, extending out from the walls of the receiver 56, and backed by the pin 66 extending from the wall, the receiver 56 and receptacle 66 being suitably provided with doors for the removal of the contents. Y

In operation, the grain having been fed in quantities into the receiver 420 drops by gravity into the hopper l7, caused tob e agitated by contact with the arm 36 of the projection 85, the grain being received inthe openings 33, flowing downwardly through the passage 82 to the grinding surfaces, and

is then conveyed outwardly through the chute 42 tothe screen 43, the finer particles dropping into the receiver 56, while the largcr particles are conveyed into the reciprocatively moved sieve 45 and then into the receptacle 46. 1

Having thus described my invention what I claimas new and desire to secure by Letters Patent, is-

In a mill for grinding grain of the character described, the combination of a movable hopper having a downwardly extending projection with a rigid casing, a grinding wheel in said casing having a plurality of conical openings'in its bottom element, a rim forming an annular space in said wheel upon said openings and a plurality of inwardly extending vertical lugs adapted to make contact with saidprojection during the rotationof said wheel, substantially as described and for the puiipose set forth.

In testimony whereof havevaflixed' my signature.

THOMAS PROKOPOWICZ. 

